[winhlp32]

Originally Posted by relentlessflame

It's been a while, but...

Spoiler for Flyable Heart ending spoilers; DO NOT read if you are playing the game or are planning to:

...aren't they alternate dimension versions of themselves, hence the innumerable similarities in personality and the cross-dimensional incompatibilities?

...then again, it's been a while so maybe I'm forgetting the actual ending details.

Spoiler for Flyable Heart spoilers:

I think they're identical twins a la Haru & Sora in Yosuga no Sora. Except in Shou's universe Yui died in the womb while he survived, and in Yui's universe Shou died in the womb.